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Courtship and Mating in Phausis Reticulata (Coleoptera: Lampyridae): Male Flight Behaviors, Female Glow Displays, and Male Attraction to Light Traps

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Courtship and Mating in Phausis Reticulata (Coleoptera: Lampyridae): Male Flight Behaviors, Female Glow Displays, and Male Attraction to Light Traps 1290 Florida Entomologist 97(4) December 2014 COURTSHIP AND MATING IN PHAUSIS RETICULATA (COLEOPTERA: LAMPYRIDAE): MALE FLIGHT BEHAVIORS, FEMALE GLOW DISPLAYS, AND MALE ATTRACTION TO LIGHT TRAPS 1* 2 3 RAPHAËL DE COCK , LYNN FAUST AND SARA LEWIS 1Evolutionary Ecology Group, University of Antwerp, B-2610 Antwerp, Belgium 211828 Couch Mill Road, Knoxville TN 37932 USA 3Department of Biology, Tufts University, Medford MA 02155 USA *Corresponding author; E-mail: [email protected] Supplementary material for this article in Florida Entomologist 97(4) (December 2014), including a video of P. reticulata mating behavior, is online at http://purl.fcla.edu/fcla/entomologist/browse ABSTRACT In contrast to most other North American fireflies that use flash dialogs for courtship, males of Phausis reticulata Say (Coleoptera: Lampyridae) (Fender 1966), often called blue ghost fireflies, glow as they fly slowly over the forest floor searching for flightless, neotenic females that are likewise bioluminescent. Recently, these Blue Ghost firefly displays have become in- creasingly popular as ecotourist attractions. Nevertheless, surprisingly little work has been done on P. reticulata courtship and mating behavior, and little is known of female oviposi- tion patterns. Extensive field observations were conducted at 2 locations in Tennessee USA, leading to the description of new categories of male mate-searching search behaviors and nightly display activities. Spectrophotometric measures of bioluminescence were similar in both sexes (λmax = 552 nm). There was a 3-fold variation in female body size, and size was correlated to the number of dorsal photic organs (3 to 9). Field experiments suggested that, in addition to their courtship glows, P. reticulata females might also emit a sex pheromone. Males were more likely to approach artificial lures that had a greater number of female-like light spots. Mean copulation duration was 7.9 ± SE 1.3 min and females oviposited an aver- age clutch size of 31 eggs (n = 3; range 27-37). Females guard their eggs and this is described for the first time in any lampyrid. We present photographs of eggs and first instar larvae. These results indicate that the courtship signaling and mating biology of P. reticulata is more complex than previously thought, and we suggest future research. Key Words: reproductive ecology, display activity, bioluminescence, sex pheromones, oviposi- tion, larva RESUMEN En contraste con la mayoría de otras luciérnagas norteamericanas que usan diálogos de flash (destellos) para el cortejo, los machos de la luciérnaga fantasma azul,Phausis reticu- lata Say (Fender 1966) (Coleoptera: Lampyridae), brillan mientras que vuelan lentamente sobre el piso del bosque en busca de hembras no voladoras y neotenicas, que son igualmente bioluminiscentes. Recientemente, estas exhibiciones de la luciérnaga fantasma azul se han vuelto cada vez más populares como atracciones ecoturísticas. Sin embargo, muy poco se ha trabajado en el cortejo y el comportamiento del apareamiento de la Ph. reticulata, y se sabe poco del patrón de oviposición de las hembras. Varios autores han sugerido que las feromonas podrían jugar un papel en el cortejo, pero no se han realizado estudios experi- mentales hasta ahora. El objetivo de este estudio fue proveer información adicional sobre la ecología reproductiva de esta especie de luciérnaga enigmática y bastante atípica. Este estudio provee varios nuevos conocimientos sobre el comportamiento del cortejo y de la eco- logía reproductiva de la luciérnaga fantasma azul norteamericana, Ph. reticulata. En base a las observaciones extensas de campo en 2 sitios en Tennessee, EE.UU., describimos varias nuevas categorías del comportamiento de búsqueda en los machos, la actividad noctura de exhibición de los machos y proveemos las primeras mediciones espectrofotométricas de las señales de cortejo bioluminiscentes emitidas por cada sexo (λmax = 552 nm). Se describe una variación de 3 veces en el tamaño del cuerpo de las hembras, que parece estar asociada con las variaciones en el número de puntos luminosos de las hembras (que van de 3 a 9 puntos de luz) y sus patrones. Los resultados de los experimentos de campo que evalúan las señales De Cock et al.: Courtship and Mating in the Blue Ghost Firefly 1291 del cortejo de las hembras sugieren la posibilidad de que, además de sus brillos de cortejo, las hembras Ph. reticulata también podrían utilizar las feromonas como una señal de cortejo. Además, nuestros experimentos usando señuelos brillantes como los de las hembras sugie- ren que los machos se acercan preferentemente a los señuelos con más puntos de luz. Por último, proveemos observaciones detalladas de la cópula (el promedio de la duración de la cópula: 7.9 ± 1.3 min SE) y el comportamiento de oviposición de la hembra (el promedio del tamaño del grupo de huevos: 31; n = 3, rango 27-37), que incluye la primera descripción de la hembra de cualquier especie de luciérnaga que vigila los huevos. También fotografiamos los huevos y por primera vez las larvas de primer estadio. Estos resultados indican que la señalización del cortejo y la biología del apareamiento de la Ph. reticulata es mucho más enigmática de lo que se pensaba anteriormente y sugieren nuevos caminos para futuras investigaciones. Palabras Clave: ecología reproductiva, actividad de exhibición, bioluminiscencia, feromonas sexuales, oviposición, larva Male Phausis reticulata Say (Coleoptera: Surprisingly little work has been done on P. Lampyridae) (Fender 1966) glow as they fly reticulata courtship and mating behavior. Frick- slowly over the forest floor searching for females Ruppert & Rosen (2008) described courtship be- (Frick-Ruppert & Rosen 2008). In contrast to haviors of both sexes and observed a few success- most other North American fireflies that use ful matings. While some authors have suggested precisely-timed flash dialogs for courtship, both that pheromones might play a role in P. reticulata sexes of P. reticulata emit long-lasting, near con- courtship (Lloyd 1965, 1997a, 1997b, 2004; Frick- tinuous glows. In forested regions of the southern Ruppert & Rosen 2008), no relevant experimental Appalachian Mountains, large numbers of males studies have been conducted. In addition, little is create an eerie glowing display, which gave rise known about female oviposition patterns (but see to the widely used nickname of “blue ghost fire- Wing 1988). fly”. Watching these blue ghost fireflies during the The goal of this study was to provide additional dual-peak flight seasons, i.e., Apr-May for “early insight into the reproductive ecology of this enig- season” and Jun-Jul for “late season (Faust & matic and rather atypical firefly species. Work- Weston 2009), has become increasingly popular, ing with field populations in Tennessee, USA, we with annual tours held at conservationist Don observed P. reticulata courtship and copulation Lewis’s “Firefly Forest” in South Carolina (http:// behaviors, as well as female oviposition behavior. upstateforever.org/portfolios/firefly-forest/) andWe also performed controlled field experiments DuPont State Forest in North Carolina (http:// to investigate courtship signals used by P. reticu- www.dupontforest.com) and other sites attract- lata females, including the relative importance ing ecotourists (http://www.yoursmokies.com/ of pheromones and bioluminescent glows. Addi- firefliesinthesmokies.html). tionally, we report here for the first time spectral Previous work described P. reticulata morphol- measurements of P. reticulata bioluminescent sig- ogy (Fender 1966), geographic distribution (Lloyd nals, intraspecific variation in female light organ 2004; Frick-Ruppert & Rosen 2008), and seasonal patterns, and detailed descriptions of copulation and nightly activity patterns (Frick-Ruppert & and oviposition, including female egg guarding. Rosen 2008). Phausis reticulata exhibits strong sexual dimorphism: while males have normal MATERIALS AND METHODS wings and can fly, the neotenic females lack both elytra and wings (Lloyd 1971, 1983, 1997a, 1997b, Distribution, Seasonality and Courtship Activity 2004; Cicero 1988; Branham & Wenzel 2003). Be- cause of the specific geographic range and the fe- This study is based on fieldwork conducted male’s larviform appearance, the species has also during 4-19 Jun 2011 and 15-26 Jun 2013 on P. been referred to as the “Appalachian glow-worm” reticulata populations within the Great Smoky (Lloyd 1971; Branham & Wenzel 2003). These Mountains National Park (GSMNP). Co-author flightless females have several spot-like light or- Lynn Faust made additional observations over 22 gans whose glow is visible dorsally through the years (1991-2013) in the GSMNP in Sevier and transparent cuticle (Lloyd 1965; Frick-Ruppert Blount counties and additionally in Morgan, Jef- & Rosen 2008). Although such “glow-worm” fe- ferson and Knox counties, Tennessee, USA. The males are common in Europe, flightless neotenic geographic distribution of P. reticulata is cen- females are rare among North American fireflies. tered in the mountains and valleys of southern Another unusual feature of P. reticulata biology Appalachia, although small populations have is that their males produce light, while the males been reported as far west as Texas and Oklaho- of most other glow-worm fireflies are not lumines- ma (Fender 1966; Lloyd 2004; Frick-Ruppert & cent (De Cock 2009). Rosen 2008). This species typically displays in 1292 Florida Entomologist 97(4) December 2014 moist forested habitats, often
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